X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=doc%2Fguides%2Fnics%2Faf_xdp.rst;h=07bdd29e29272fccee9327bd9121fee1f43fae94;hb=9c1e0dc39a03c95447095241eaf3764d2e0dd003;hp=18defcda37e194e5747575b4de35251ffdba40f6;hpb=339b88c6a91f84bca1a35d53a2d1bee551b4ceb5;p=dpdk.git

diff --git a/doc/guides/nics/af_xdp.rst b/doc/guides/nics/af_xdp.rst
index 18defcda37..07bdd29e29 100644
--- a/doc/guides/nics/af_xdp.rst
+++ b/doc/guides/nics/af_xdp.rst
@@ -18,8 +18,11 @@ packets through the socket which would bypass the kernel network stack.
 Current implementation only supports single queue, multi-queues feature will
 be added later.
 
-Note that MTU of AF_XDP PMD is limited due to XDP lacks support for
-fragmentation.
+AF_XDP PMD enables need_wakeup flag by default if it is supported. This
+need_wakeup feature is used to support executing application and driver on the
+same core efficiently. This feature not only has a large positive performance
+impact for the one core case, but also does not degrade 2 core performance and
+actually improves it for Tx heavy workloads.
 
 Options
 -------
@@ -29,7 +32,6 @@ The following options can be provided to set up an af_xdp port in DPDK.
 *   ``iface`` - name of the Kernel interface to attach to (required);
 *   ``start_queue`` - starting netdev queue id (optional, default 0);
 *   ``queue_count`` - total netdev queue number (optional, default 1);
-*   ``pmd_zero_copy`` - enable zero copy or not (optional, default 0);
 
 Prerequisites
 -------------
@@ -41,6 +43,8 @@ This is a Linux-specific PMD, thus the following prerequisites apply:
    User can install libbpf via `make install_lib` && `make install_headers` in
    <kernel src tree>/tools/lib/bpf;
 *  A Kernel bound interface to attach to;
+*  For need_wakeup feature, it requires kernel version later than v5.3-rc1;
+*  For PMD zero copy, it requires kernel version later than v5.4-rc1;
 
 Set up an af_xdp interface
 -----------------------------
@@ -49,4 +53,27 @@ The following example will set up an af_xdp interface in DPDK:
 
 .. code-block:: console
 
-    --vdev net_af_xdp,iface=ens786f1,queue=0
+    --vdev net_af_xdp,iface=ens786f1
+
+Limitations
+-----------
+
+- **MTU**
+
+  The MTU of the AF_XDP PMD is limited due to the XDP requirement of one packet
+  per page. In the PMD we report the maximum MTU for zero copy to be equal
+  to the page size less the frame overhead introduced by AF_XDP (XDP HR = 256)
+  and DPDK (frame headroom = 320). With a 4K page size this works out at 3520.
+  However in practice this value may be even smaller, due to differences between
+  the supported RX buffer sizes of the underlying kernel netdev driver.
+
+  For example, the largest RX buffer size supported by the underlying kernel driver
+  which is less than the page size (4096B) may be 3072B. In this case, the maximum
+  MTU value will be at most 3072, but likely even smaller than this, once relevant
+  headers are accounted for eg. Ethernet and VLAN.
+
+  To determine the actual maximum MTU value of the interface you are using with the
+  AF_XDP PMD, consult the documentation for the kernel driver.
+
+  Note: The AF_XDP PMD will fail to initialise if an MTU which violates the driver's
+  conditions as above is set prior to launching the application.